You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
140 lines
3.7 KiB
140 lines
3.7 KiB
/* |
|
* Copyright (c) 2022, Maxmillion McLaughlin |
|
* Copyright (c) 2020, SER Consulting LLC / Steven Riedl |
|
* |
|
* SPDX-License-Identifier: Apache-2.0 |
|
*/ |
|
|
|
#define DT_DRV_COMPAT microchip_mcp9600 |
|
|
|
#include <zephyr/device.h> |
|
#include <zephyr/drivers/i2c.h> |
|
#include <zephyr/drivers/sensor.h> |
|
#include <zephyr/kernel.h> |
|
#include <zephyr/logging/log.h> |
|
|
|
LOG_MODULE_REGISTER(MCP9600, CONFIG_SENSOR_LOG_LEVEL); |
|
|
|
#define MCP9600_REG_TEMP_HOT 0x00 |
|
|
|
#define MCP9600_REG_TEMP_DIFF 0x01 |
|
#define MCP9600_REG_TEMP_COLD 0x02 |
|
#define MCP9600_REG_RAW_ADC 0x03 |
|
|
|
#define MCP9600_REG_STATUS 0x04 |
|
|
|
#define MCP9600_REG_TC_CONFIG 0x05 |
|
#define MCP9600_REG_DEV_CONFIG 0x06 |
|
|
|
#define MCP9600_REG_A1_CONFIG 0x08 |
|
#define MCP9600_REG_A2_CONFIG 0x09 |
|
#define MCP9600_REG_A3_CONFIG 0x0A |
|
#define MCP9600_REG_A4_CONFIG 0x0B |
|
|
|
#define MCP9600_A1_HYST 0x0C |
|
#define MCP9600_A2_HYST 0x0D |
|
#define MCP9600_A3_HYST 0x0E |
|
#define MCP9600_A4_HYST 0x0F |
|
|
|
#define MCP9600_A1_LIMIT 0x10 |
|
#define MCP9600_A2_LIMIT 0x11 |
|
#define MCP9600_A3_LIMIT 0x12 |
|
#define MCP9600_A4_LIMIT 0x13 |
|
|
|
#define MCP9600_REG_ID_REVISION 0x20 |
|
|
|
struct mcp9600_data { |
|
int32_t temp; |
|
}; |
|
|
|
struct mcp9600_config { |
|
const struct i2c_dt_spec bus; |
|
}; |
|
|
|
static int mcp9600_reg_read(const struct device *dev, uint8_t start, uint8_t *buf, int size) |
|
{ |
|
const struct mcp9600_config *cfg = dev->config; |
|
|
|
return i2c_burst_read_dt(&cfg->bus, start, buf, size); |
|
} |
|
|
|
static int mcp9600_sample_fetch(const struct device *dev, enum sensor_channel chan) |
|
{ |
|
struct mcp9600_data *data = dev->data; |
|
uint8_t buf[2]; |
|
int ret; |
|
|
|
if (chan != SENSOR_CHAN_ALL && chan != SENSOR_CHAN_AMBIENT_TEMP) { |
|
LOG_ERR("Unsupported sensor channel"); |
|
return -ENOTSUP; |
|
} |
|
|
|
/* read signed 16 bit double-buffered register value */ |
|
ret = mcp9600_reg_read(dev, MCP9600_REG_TEMP_HOT, buf, sizeof(buf)); |
|
if (ret < 0) { |
|
data->temp = 1; |
|
return ret; |
|
} |
|
|
|
/* device's hot junction register is a signed int */ |
|
data->temp = (int32_t)(int16_t)(buf[0] << 8) | buf[1]; |
|
|
|
/* 0.0625C resolution per LSB */ |
|
data->temp *= 62500; |
|
|
|
return 0; |
|
} |
|
|
|
static int mcp9600_channel_get(const struct device *dev, enum sensor_channel chan, |
|
struct sensor_value *val) |
|
{ |
|
struct mcp9600_data *data = dev->data; |
|
|
|
if (chan != SENSOR_CHAN_AMBIENT_TEMP) { |
|
return -ENOTSUP; |
|
} |
|
|
|
if (data->temp == 1) { |
|
return -EINVAL; |
|
} |
|
|
|
val->val1 = data->temp / 1000000; |
|
val->val2 = data->temp % 1000000; |
|
|
|
return 0; |
|
} |
|
|
|
static DEVICE_API(sensor, mcp9600_api) = { |
|
.sample_fetch = mcp9600_sample_fetch, |
|
.channel_get = mcp9600_channel_get, |
|
}; |
|
|
|
static int mcp9600_init(const struct device *dev) |
|
{ |
|
const struct mcp9600_config *cfg = dev->config; |
|
uint8_t buf[2]; |
|
int ret; |
|
|
|
if (!i2c_is_ready_dt(&cfg->bus)) { |
|
LOG_ERR("mcp9600 i2c bus %s not ready", cfg->bus.bus->name); |
|
return -ENODEV; |
|
} |
|
|
|
ret = mcp9600_reg_read(dev, MCP9600_REG_ID_REVISION, buf, sizeof(buf)); |
|
LOG_DBG("id: 0x%02x version: 0x%02x", buf[0], buf[1]); |
|
|
|
return ret; |
|
} |
|
|
|
#define MCP9600_DEFINE(id) \ |
|
static struct mcp9600_data mcp9600_data_##id; \ |
|
\ |
|
static const struct mcp9600_config mcp9600_config_##id = { \ |
|
.bus = I2C_DT_SPEC_INST_GET(id), \ |
|
}; \ |
|
\ |
|
SENSOR_DEVICE_DT_INST_DEFINE(id, mcp9600_init, NULL, &mcp9600_data_##id, \ |
|
&mcp9600_config_##id, POST_KERNEL, \ |
|
CONFIG_SENSOR_INIT_PRIORITY, &mcp9600_api); |
|
|
|
DT_INST_FOREACH_STATUS_OKAY(MCP9600_DEFINE)
|
|
|